Bubble forming device



FIG. 1 is a perspective view of a bubble forming device showing my new design.

FIG. 2 is a side elevational view thereof.

FIG. 3 is a top plan view thereof.

FIG. 4 is an end elevational view thereof.

FIG. 5 is an opposite end elevational view thereof. 

The ornamental design for a bubble forming device, as shown and described. 